Gram staining has been a cornerstone of microbiology for over a century, and it is a laboratory method used to differentiate bacterial species into two large groups (Gram-positive and Gram ...

Gram-negative bacteria show pink or red on staining and have thin walls. They release different toxins and affect the body in different ways. Gram-positive and Gram-negative are types of bacteria.

But what are the differences between gram-positive and gram-negative bacteria? The names themselves date back to 1884, when Danish bacteriologist Hans Christian Gram developed a staining procedure ...